Tensile and creep performance of a novel mullite fiber at high temperatures

被引：34

作者：

Almeida, Renato S. M. ^{[1
]}

Tushtev, Kamen ^{[1
]}

Clauss, Bernd ^{[2
]}

Grathwohl, Georg ^{[1
]}

Rezwan, Kurosch ^{[1
,3
]}

机构：

[1] Univ Bremen, Adv Ceram, D-28359 Bremen, Germany

[2] Inst Text Chem & Chem Fibers, D-73770 Denkendorf, Germany

[3] Univ Bremen, MAP Ctr Mat & Proc, D-28359 Bremen, Germany

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2015年 / 76卷

关键词：

Ceramic fiber; Mechanical properties; High-temperature properties; Inelastic deformation; MECHANICAL-PROPERTIES; ALPHA-ALUMINA; OXIDE FIBERS; GRAIN-GROWTH; COMPOSITES; DEGRADATION; EVOLUTION; STRENGTH; ROOM;

D O I：

10.1016/j.compositesa.2015.05.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The novel fiber CeraFib75 with a composition near to pure mullite was analyzed with respect to its potential for high-temperature applications. This mullite fiber free of glass phase was aimed to overcome the strength of commercial oxide fibers at high-temperatures. Tensile tests at room and high temperatures ranging from 900 to 1400 degrees C and creep tests were performed. Nextel (TM) 720, another crystalline mullite-alumina fiber, was tested as a reference. Microstructure and crystal phase analysis of the new fiber revealed mullite grains with traces of and a-alumina in-between; it contains occasionally defects causing a reduced strength at room-temperature. Remarkably, at temperatures beyond 1200 degrees C, CeraFib75 presented a higher tensile strength than Nextel (TM) 720. During tensile tests at 1400 degrees C, an extended region of inelastic deformation was observed for CeraFib fibers only, which was related to a grain boundary sliding mechanism. Creep rates were of the same order of magnitude for both fibers. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：37 / 43

页数：7

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